Two spiral vortex breakdowns in confined swirling flow
Mikhail Tsoy, Sergey Skripkin, И. В. Литвинов
Abstract
Two different scenarios of spiral vortex breakdown are observed experimentally and further investigated numerically in the swirl flow into a conical diffuser. The primary spiral vortex breakdown is observed near the inlet of the conical diffuser in cases of the cone angle β>3°. The secondary spiral vortex breakdown occurs at the exit of the cone at β≤3°. Also, the coexistence of two spiral vortices is observed. For the first time, we have visualized and explained the reasons of these observations.
Topics & Concepts
VortexPhysicsSpiral (railway)Conical surfaceMechanicsDiffuser (optics)Flow (mathematics)InletVortex ringLigand cone angleClassical mechanicsOpticsGeometryMathematical analysisLight sourceMechanical engineeringMathematicsEngineeringFluid Dynamics and Turbulent FlowsAerodynamics and Acoustics in Jet FlowsCombustion and flame dynamics